What is the critical f(x,y)=(x+y)(xy+1) ?

The critical f(x,y)=(x+y)(xy+1) is (-1,1),(1,-1)

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critical f(x,y)=(x+y)(xy+1)

critical points

f (x, y) = (x + y) (x y + 1)

(- 1, 1), (1, - 1)

Solution steps

(x + y) (x y + 1)

Find where

\nabla f (x, y)

is equal to zero or undefined

(- 1, 1), (1, - 1)

f (x) = x^{\frac{3}{4}} - 3 x^{\frac{1}{4}}

f (x) = 2 x^{3} + 9 x y^{2} + 15 x^{2} + 27 y^{2}

e^{- 3.5 x^{2}}

f (x) = x^{\frac{4}{5}} (2 x - 9)

f (x) = x^{2} - 3 x + 8

What is the critical f(x,y)=(x+y)(xy+1) ?
The critical f(x,y)=(x+y)(xy+1) is (-1,1),(1,-1)